All Free Chemistry MCQs with Answers

• A. Hydrogen free radical
• B. Chlorine free radical
• C. Hydrogen chloride molecule
• D. Both hydrogen and chlorine free radicals

Explanation: To break the covalent bond between two chlorine atoms, photons of ultraviolet rays are required.

• A. Cl2
• B. F2
• C. I2
• D. Br2

Explanation: 'Fluorine' (F2) is the most reactive halogen as it has a small size and high charge density.

• A. CHCl3
• B. CCl4
• C. CH2Cl2, CH3Cl
• D. All of these

Explanation: It shows a free radical substitution reaction in which UV light (sunlight) is used to substitute the Hs of the CH4.

• A. Heat
• B. Sunlight
• C. Catalyst
• D. Oxygen

Explanation: 'Ultraviolet light' is simply a source of energy and is being used to break bonds.

• A. Nitric acid
• B. Oxygen
• C. Halogen
• D. All of these

Explanation: Reason: Alkanes undergo very few reactions. One of these is the reaction with halogens to form halogenoalkanes.

• A. Cl2
• B. F2
• C. I2
• D. Br2

Explanation: Fluorine (F) is the most reactive halogen and therefore reacts faster with alkanes in substitution reactions.

• A. Heat
• B. Sun light
• C. Catalyst
• D. Oxygen

Explanation: Option B is correct since sunlight is simply a source of energy, and is being used to break bonds.

• A. Nitric acid
• B. Oxygen
• C. Halogen
• D. All of these options are correct

Explanation: When halogens react with alkanes, the reaction is a free radical reaction.

• A. Carbonyl dichloride
• B. Phosphoryl chloride
• C. Carbon tetrachloride
• D. C2O & PH3

Explanation: a) Carbonyl dichloride:Phosgene is commonly known as carbonyl dichloride. Its chemical formula is COCl2.

• A. Alcohols
• B. Ketones
• C. Carboxylic Acid
• D. Ethers

Explanation: The general formula CnH2nO2 is for carboxylic acids and esters.

• A. RCOR
• B. RCOOR
• C. RCHO
• D. RCOOH

Explanation: The general formula for aldehydes is RCHO, where R represents an organic group.

• A. Functional groups
• B. Homologous series
• C. Alkane
• D. Atoms

Explanation: Functional groups are groups of atoms in a compound, that determine the chemical behavior of the compound and gives specific properties to…

• A. NH4CNO
• B. NH2COCH3
• C. NH2CONH2
• D. NH2COONH

Explanation: OPTION A: NH4CNO is not an amide because it contains a nitrogen atom bound to hydrogen, not to a carbonyl group (C=O).OPTION B: Amides are…

• A. Aldehyde
• B. Alcohol
• C. Esters
• D. Ketones

Explanation: d) Ketones This option is correct. While Camphor contains a ketone functional group, Menthone contains a ketone group, not a ketone.

• A. Functional groups
• B. Homologous series
• C. Alkane
• D. Atoms

Explanation: A functional group is an atom or a group of "atoms" that give specific physical and chemical properties to the organic compounds…

• A. Better yield
• B. Lower yield
• C. Lower rate
• D. Cost decrease

Explanation: Explanation for this question will be added soon.

• A. Endothermic reaction
• B. Exothermic reaction
• C. Irreversible reaction
• D. Slow reaction

Explanation: Bond-making itself is an exothermic process because to make the bonds, heat energy is given off when compounds come closer, which makes…

• A. Endothermic reaction
• B. Exothermic reaction
• C. Irreversible
• D. Slow

Explanation: In the Haber process, "the atmospheric nitrogen (N2) is converted to ammonia (NH3) by reacting it with hydrogen (H2)".

• A. Solid state
• B. Liquid state
• C. Gaseous state
• D. None of these options are correct

Explanation: The Haber Process combines nitrogen from the air with hydrogen to form ammonia.

• A. 30%
• B. 32%
• C. 35%
• D. 33%

Explanation: Remember that in Haber's process, the volume percentage of ammonia in the equilibrium mixture is 35%.